Most people use them to setup sip trunks to extend there VOIP into to the telco world over IP.

I have used them to connect 2 different voip systems together, you can use them for call admission control, and a few other things as well. What do you plan on using it for.

I guess that it would be used primarily to bond 2 different VoIP systems? And to help with the migration from TDM PBXs to an all VoIP solution.
So, if a company that provides hosted VoIP to a customer has issues with the Company based VoIP system either registering the VoIP sets or the passing of traffic, it may alleviate the issue of the call manager not doing this?

if you want to bond 2 voip systems together both voip systems have to work. You will just be using the cube to terminate sip trunks or route calls through it. If you had problems with one of the voip systems you would still have to fix it before you could use the CUBE.

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